Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/163658
Title: In-situ chemical attenuation of pharmaceutically active compounds using CaO₂: influencing factors, mechanistic modeling, and cooperative inactivation of water-borne microbial pathogens
Authors: Zheng, Ming
Gao, Bing
Zhang, Jie
El-Din, Mohamed Gamal
Snyder, Shane Allen
Wu, Minghong
Tang, Liang
Keywords: Engineering::Environmental engineering
Issue Date: 2022
Source: Zheng, M., Gao, B., Zhang, J., El-Din, M. G., Snyder, S. A., Wu, M. & Tang, L. (2022). In-situ chemical attenuation of pharmaceutically active compounds using CaO₂: influencing factors, mechanistic modeling, and cooperative inactivation of water-borne microbial pathogens. Environmental Research, 212(Part D), 113531-. https://dx.doi.org/10.1016/j.envres.2022.113531
Journal: Environmental Research
Abstract: Water polluted by pharmaceutically active compounds (PhACs) and water-borne pathogens urgently need to develop eco-friendly and advanced water treatment techniques. This paper evaluates the potential of using calcium peroxide (CaO2), a safe and biocompatible oxidant both PhACs (thiamphenicol, florfenicol, carbamazepine, phenobarbital, and primidone) and pathogens (Escherichia coli, Staphylococcus aureus) in water. This paper evaluates the potential of using calcium peroxide (CaO2) as a safe and biocompatible oxidant to remove both PhACs (thiamphenicol, florfenicol, carbamazepine, phenobarbital, and primidone) and pathogens (Escherichia coli, Staphylococcus aureus) in water. The increased CaO2 dosage increased efficiencies of PhACs attenuation and pathogens inactivation, and both exhibited pseudo-first-order degradation kinetics (R2 > 0.90). PhACs attenuation were mainly via oxidization (H2O2, •OH/O•-, and O2•-) and alkaline hydrolysis (OH-) from CaO2. Moreover, concentrations of these reactive species and their contributions to PhACs attenuation were quantified, and mechanistic model was established and validated. Besides, possible transformation pathways of target PhACs except primidone were proposed. As for pathogen indicators, the suitable inactivation dosage of CaO2 was 0.1 g L-1. The oxidability (18-64%) and alkalinity (82-36%) generated from CaO2 played vital roles in pathogen inactivation. In addition, CaO2 at 0.01-0.1 g L-1 can be applied in remediation of SW contaminated by PhACs and pathogenic bacteria, which can degrade target PhACs with efficiencies of 21-100% under 0.01 g L-1 CaO2, and inactivate 100% of test bacteria under 0.1 g L-1 CaO2. In short, capability of CaO2 to remove target PhACs and microbial pathogens reveals its potential to be used as a representative technology for the advanced treatment of waters contaminated by organic compounds and microbial pathogens.
URI: https://hdl.handle.net/10356/163658
ISSN: 0013-9351
DOI: 10.1016/j.envres.2022.113531
Research Centres: Nanyang Environment and Water Research Institute 
Rights: © 2022 Elsevier Inc. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:NEWRI Journal Articles

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